1) `(2x-1)^3=27`
⇒`(2x-1)^3=3^3`
⇒`2x-1=3`
⇒`2x=3+1`
⇒`2x=4`
⇒`x=4:2`
⇒`x=2`
Vậy `x=2`
2) `(2x-3)^2=25`
⇒`(2x-3)^2=+-5^2`
⇒\(\left[ \begin{array}{l}2x-3=5\\2x-3=-5\end{array} \right.\)
⇒\(\left[ \begin{array}{l}2x=5+3\\2x=-5+3\end{array} \right.\)
⇒\(\left[ \begin{array}{l}2x=8\\2x=-2\end{array} \right.\)
⇒\(\left[ \begin{array}{l}x=8:2\\x=-2:2\end{array} \right.\)
⇒\(\left[ \begin{array}{l}x=4\\x=-1\end{array} \right.\)
Vậy `x=4` hoặc `x=-1`
